Pipe cutter



April 3, 1928.

J. o. GAFFNY PIPE CUTTER Filed Aug. 26. 1926 FIGURE 5 INVENTOB I ATTORNEY FIGURE 1 Patented A 3 19288 JOHN o. GAEFFNEY, or Annexe Gleaner CALIFORNIA.

PIPE curr es.

Application flle'cl' August 26, 1926. Serial No. 131,649

This invention relates particularly to a de-- vice for cutting cast iron pipe.

It is one object of the. invent-ion to provide a device of the character indicated which includes a means for holding the pipe against movement while being cut.

It is another object of the invention to provide a pipe holding means secured in positionby the cuttting device whereby to eliminate the necessity of providing a vise or similar holding means for the pipe.

It is also an object of the invention to provided a device of the character indicated wherein a plurality of cutting elements are arranged about a pipe to be cut and provided with means for securing the desired pressure of the several cutting elements at all stages of the cutting process. It is still a further object to provide a device of the character indicated that will be simple in construction, economical to manufacture, adapted to be used on various sizes of pipes, and highly eflicient in its practical application.

In the drawing:

Figure 1 is a perspective illustration of a pipe cutter embodying my invention, partly in section and part being-broken away.

Figure 2 is a vertical transverse section through the device, partly in elevation and part broken away.

Figure 3 is a detail section on 33 of Figure 2.

Referring more particularly to the drawing, I show at 1' a supporting standard provided with a foot 2 mounted thereon at right angles to its longitudinal axis, the said foot having acurvilinear under surface 3 pro vided with a plurality of teeth 4 and curving in opposite directions from said axis. A short distance above the foot 2 is mounted, a collar 5' carrying a guide 6 having its central port-ion lying in a plane intersecting the standard at right anglesto. its longitudinal axis, the guide 6 having its central portion 7 curved in concentric relation to the pipe on which it is to be used and provided with a vertical slot 8 as shown. A groove 9 is formed in the side walls,of the slot 8 as shown.

At 11 I show a pipe adapted to pass freely through the vertical slot 8 in guide 6, the upper portion of the pipe being formed into a handle portion 12 tapped to receive a threaded rod 13 extending above its upper end as at 14. Depending from the lower end of the rod 13 is a pin 15 having a swivelled connection. at 16 with an element 17. To the element 17 is connected a chain indicated generally by the reference 18 and constructed in detail as follows. I

Each link comprises spaced side bars 19l9 having the pins 20 passing therethrough. On each pin 20 is mounted a cutter element comprising a hub portion 21 having a diameter slightly larger than the width of the side plates 19 and an annular cutting edge 22 slightly larger in diameter than the hub portions'2l. The end of the chain re mote from the swivel 16 is connected to the lower end of the pipe 11 by any suitable means such as a hook and pin connection 23. On the outside of pipe 11 are mounted laterally extending pins 24: adapted to engage slot 8 as shown.

It is desirable, of course, to maintain contact of the cutting edges of the chain with the pipe throughout the full circumference of the pipe. To secure this end I provide a bearing member or guide 25 on the lower end of the pipe 11 and on the edge opposite to the connection 23 as shown. This guide has its under side curved as at 26, and has a. shouldered groove 27 throughout the length of its under surface to permit the ready passa'ge'ofthecu'tter elements of the chain.

When ready for use the device is assembled as hereinbefore described with a handle 10 screwed into the part 5' as shownand a leg 29-mou'nted on the guide 6 on the side opposite to the handle 10 and teeth 4 and consequently with the parts 11-25 positioned between the leg and parts 4, 5* and 10.

In use the device is first assembled as dc scribed and the chain 18 slipped over the pipe 28 into the desired position. If the threaded rod 13 is now rotated in the handle portion 12 of the pipe 11 the chain will be pulled'upinto the pipe in the direction indi'cated' by the arrowBO. In this movement the hubportions 21 of the several cutter elements engage the lower surface 26 of the member 25wl 1ile the cutting edges themselves move in the groove 27. As the chain tightens the pins 24: press downwardly on guide 6 and force the teeth at on foot 2 into positive engagement with the surface of pipe 28, and since the leg 29 is also forced into engagement with the pipe the handle 10 is maintained in vertical relation to the axis of the pipe and the guide 6 is maintained in concentric relation thereto.

When the device is firmly seated the op- I erator grasps the handle and thereby effectually holds the pipe 28 against rotation. He then grasps the handle 12 and swings it forwardly and backwardly with the pins 24 sliding in the grooves 8, thereby reciprocating the chain 18 a distance as allowed by the guide 6. In this process the cutting edges 22 enter the pipe 28 and the chain may become slack but this slackness may be taken up by the adjustment 13,

It may now be seen that I have provided a device that may be quickly adjusted on a pipe of any size within its range of ad justment, and one wherein the pipe being cut is firmly held against movement Without the use of a vise or other separate holding means.

It is to be understood, of course, that while I have herein shown and described but one specific embodiment of the invention, changes in form, construction. and method of application and operation may be made within the scope of the appended claims.

I claim:

1. A pipe cutter comprising a handle having a tubular end portion, a chain connected to the tubular end portion at one end and having its other end inserted in said tubular end portion, an adjusting device inserted between said handle and the last mentioned end of the chain, an annular cutter element mounted in each link of the chain, and a guide member mounted on the pipe to engage the chain and provided with a central groove to permit passage of the cutting elements of the chain.

2. A pipe cutter comprising a chain and means for adjusting the same about a pipe, said means including a shoulder groove, each link; of the said chain including a connecting bar, a pin passing therethrough and a cutter element mounted on said pin, said cutter element comprising a hub portion of greater diameter than the width of said bar whereby to engage the shoulders on said groove and an annular cutting edge of greater diameter than said hub portion.

A pipe cutter comprising a supporting member having a pipe-engaging foot, a guide carried by said member, a handle having a tubular end portion and pro vided with means for engaging said guide, a chain having one end attached to the said handle and the other entering said tubular neeaoeo foot for engaging a pipe surface, a guide element mounted on said member and having its central portion lying in a planeintersecting the longitudinal axis of the member at right angles and curved in both directions therefrom, a. handle engaging said guide element to reciprocate therein and provided with laterally projecting pins engageable withsaid guide member, and provided with a tubular end portion, a chain having one end attached to said handle and the other entering said tubular portion adjusting means inserted between the handle and said last mentioned end of the chain, and a cutting element operativelymounted ineach link of the said chain.

5. Apipe cutter comprising a pipe gripping device, a handle therefor, and a guide mounted thereon in substantially concentric relation to the pipe to be cut, a handle mounted in said guide andsupported thereby, a chain mounted on said last mentioned handle, adjusting means inserted between said chain and handle, anda' cutting element operatively mounted in 'eachilinkof said chain. l j

6. A pipe cutter COIIIPIlSlDg a pipe engaging elementand ahandle therefor and means for preventing relative movement between the element and pipe, an adjustable annular pipe cutting device reciprocable about the axis of the pipe, and a connec tion between said pipe engaging element and said cutting device whereby the ad-- justment of the latter to engage: a pipe exerts pressure upon the former to more closely engage the said pipe.

7. A pipe cutter comprisinga pipe gripping device and ahandle therefor, a guide mounted thereon and extending laterally therefrom, a pipe engaging leg carried by said guide, a handle mounted to reciprocate in said guide between said leg and gripping device, a flexible pipe cutting device connected at one end to said handle,.and anadjusting device connecting the other end of said cutting device to said handle.

JOHN o. GAFFNEY, 

